I wondered about the white wheels. I've seen builder photos that seem to have a white running board stripe and white wheels but I wondered how long those would last in actual service. Jerry at Hobbyland still has a 9000 I purchased the 9004 since the Lionel version appears to be modeled after late life modifications.
Here are a couple of clear left and right photos of the earlier prototype by way of the Denver Public Library digitial photos. Courtesey of the Otto Perry Railroad Photograph Collection.
In case anyone wants it...Here is the link I use to get right to the Denver Library photo search page. It's a huge resource I discovered not too long ago. Union Pacific fans might find it useful or just enjoy looking through all the photos they have:
http://digital.denverlibrary.org/cdm/
I use it frequently to research the UP locomotives I choose to purchase. I think it's pretty cool. In the "quick photo search" field enter whatever UP engine Type I'm looking for (Union Pacific 4-6-2, Union Pacific 4-8-2 etc...), and I'll find tons of photos by wheel arrangement and decade of service. For these examples I just typed: Union pacific 4-12-2
Each photo has a description of Date, speed, location and photographer if available. In the informatio section of each photo they ususally have other links including one for Otto Perry crediting him for the photos.